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ALEXANDER VON  HUMBOLDT.                125
Cossacks., across "Woronesch and Tula, and arrived in
Petersburg on. the 13th November. Humboldt re-
mained here only as long as his obligations to the
government and court required, and imtil the re-
ceipt of his specimens, and arrived safely in Berlin on
the 28th December, 1829.
Humboldt had been absent from Berlin from the
12th April to the 28th December, and such a consi-
derable territory has probably never been explored in
such a short space of time. During eight months and
alialf he had travelled a distance of 2500 geographi-
cal miles on land.
This journey, like the American one, was of im-
mense importance for the physical - geographical
sciences in their most extensive form. The marvel-
lously extensive materials which Humboldt brought
with him, and their application to a just compre-
hension of the nature of the earth, would not bear com-
pression into a condensed, popularly comprehensible
description. The results of the journey were therefore
to be published in three works, of which each of the
travellers tinclertook to prepare one. Humboldt's
Cf Fragmeiis de G^ologie et de Climatologie AsiatiqueJ>
was the first to appear ; a portion of it, however, only
flowed direct from Humboldt's pen, and it contains
rmich varied matter, very productive for further scien-
tific works, and which has been enlarged by Klaproth
with important notes.             .
These Asiatic fragments can only be considered as
the forerunner of a greater work ; but we must indi-
cate its general contents to show what were Hum-
bolclt^ chief studies and researches during this journey
to Central Asia. The fir^t volume of the original
French work treats especially of the mountain-ridges
and volcanoes of Central Asia, with additional re-
marks on. the thermo-waters of ALagut, and on the
gas-mud and fire eruptions on various spots of Central
Asia and America. This shows how Humboldt con-
stantly compared and combined his new discoveries
and experiences in Asia with those of America, and